The immobilizer is the anti-theft system that allows the engine to start only when it recognizes a correctly programmed key. When the key, the antenna at the ignition, the immobilizer module or the engine computer stop communicating, the vehicle may crank without starting, or not crank at all, and a security or key light usually appears on the dash. Chicago Car Keys provides mobile immobilizer diagnosis and repair in Chicago, Cook County, and DuPage County for compatible vehicles.
Immobilizer faults have several possible causes, so we start by identifying which part of the system has failed. The transponder chip in the key may be damaged, a key may have lost its programming, the antenna that reads the key may have failed, or a module may have been replaced without being synchronized to the vehicle. Low battery voltage and wiring faults can produce the same symptoms. The repair is then matched to the cause, and we explain the findings before performing additional work. Because this is security-related work, identification and proof of ownership are required.
Immobilizer Services We Provide
- Diagnosis of immobilizer and security-light no-start conditions
- Transponder and smart key programming and reprogramming
- Immobilizer synchronization after an ECM, PCM or BCM replacement
- Replacement keys when the chip in the original key has failed
- Evaluation of immobilizer antenna and module faults
Common Immobilizer Symptoms
Typical signs include a flashing security or key light, an engine that starts and then shuts off after a second or two, a vehicle that cranks but will not start with a key that used to work, a spare key that works when the main key does not, and a no-start that began after a module or ignition repair.
Mobile Immobilizer Service
Our mobile service is based in ZIP code 60632, and we come to the vehicle, so in most cases no tow is needed. Compatibility depends on the year, make, model and key system, so have the VIN ready and let us know how many working keys you have when you call.
Frequently Asked Questions
Why is my security light flashing and the car will not start?
It usually means the vehicle is not recognizing the key. The cause may be the key itself, the antenna that reads it, a module, or low voltage, which is why diagnosis comes first.
Can a weak key fob battery cause an immobilizer problem?
On some vehicles, yes. A weak fob battery can prevent the key from being recognized. Many vehicles have a backup starting procedure described in the owner’s manual.
Do I need a new key or a new module?
That depends on the diagnosis. Many immobilizer problems are resolved by programming or replacing a key, while others require module synchronization or repair.
Will a replacement engine computer need immobilizer programming?
On many vehicles, yes. The replacement module has to be synchronized with the immobilizer and the keys before the vehicle will start.
Do I have to tow my car to you?
In most cases, no. We are a mobile service and work on the vehicle where it is parked.
Related Key and Programming Services
If the key is the cause, see our transponder key programming and smart key programming services. For module replacement, see PCM and ECM reprogramming and BCM programming and cloning. Volkswagen and Audi owners can also review immobilizer key services.
Security light on and the car will not start? Call (773) 521-7000 for mobile immobilizer service availability in Chicago.